Can a palm reader diagnose Down syndrome and can a fingerprints confirm your parentage? Science used to read palms to diagnose disease. Harold Cummins was the founder of dermatoglyphics: the discipline of analysing patterns found in skin prints on the fingers, palms and soles. During the 1930s, research was focused on variation in fingerprint patterns. The arches, loops, and whorls were categorised into normal profiles, distinct for different racial populations. Cummins documented certain tendencies in the handprint patterns of people with ‘mongolism’. [Since the 1860s, ‘mongolism’ was the name used to describe Down syndrome when a doctor called John Langdon Down tried to classify different types of conditions by ethnic characteristics. In 1961, genetic experts sent a joint letter to the medical journal The Lancet urging the medical community to abandon its use of the term ‘mongolism’. The Mongolian People’s Republic also requested the term fall into disuse and in 1965, the World Health Organization (WHO) agreed
Using paediatric handprints, Cummins could diagnose Down syndrome with greater accuracy than experienced physicians who relied on physical appearance. Interest in dermatoglyphics soared and during the 1950s and 1960s, studies tried to identify the heritability of fingerprint patterns and attempted to develop fingerprint-based paternity tests. In the early 1960s when chromosomal studies were being developed, dermatoglyphics was used to support genetic research. Studies were underway to use dermatoglyphics to predict right versus left-handedness, schizophrenia, eye disease, and hereditary heart conditions. Ironically, the rise of human genetics as a field of study spelt the end for dermatoglyphics.
Nevertheless, modern doctors still look for the signs of Down syndrome by looking at hands and feet. Apart from abnormal patterns on the fingertips, characteristic features include short hands and fingers, a single palmar transverse crease (simian crease), fifth finger clinodactyly, and a sandal gap deformity (a wide space between the first and second toes).
There is another inclusion to Cummins’ legacy: The longest English word with no repeated letters is subdermatoglyphic.